DO NOT MERGE: Call handleInitialize() in the end of constructor

- Avoid race condition when variables are not initialized but the
handler thread tries to use them.

Bug: 159504970
Test: on device
Change-Id: Id26e2d804e91c7dc013fb6783c8d923e6319af15

services/core/java/com/android/server/location/gnss/GnssLocationProvider.java

@@ -678,8 +678,6 @@ public class GnssLocationProvider extends AbstractLocationProvider implements
         mNetworkConnectivityHandler = new GnssNetworkConnectivityHandler(context,
                 GnssLocationProvider.this::onNetworkAvailable, mLooper, mNIHandler);
 
-        sendMessage(INITIALIZE_HANDLER, 0, null);
-
         mGnssStatusListenerHelper = new GnssStatusListenerHelper(mContext, mHandler) {
             @Override
             protected boolean isAvailableInPlatform() {
@@ -746,6 +744,8 @@ public class GnssLocationProvider extends AbstractLocationProvider implements
 
         setProperties(PROPERTIES);
         setAllowed(true);
+
+        sendMessage(INITIALIZE_HANDLER, 0, null);
     }
 
     /**